From f1de24feb89d6516c35b7c34c0fb7dc57e8d865d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Pierre-=C3=89tienne=20Meunier?= <pe@pijul.org>
Date: Fri, 16 Nov 2018 12:12:59 +0000
Subject: [PATCH] Rust build-support: fixing a compilation error in some crates
 (such as proc-macro2)

---
 .../rust/build-rust-crate/configure-crate.nix             | 2 ++
 .../build-support/rust/build-rust-crate/install-crate.nix | 8 +++++---
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/pkgs/build-support/rust/build-rust-crate/configure-crate.nix b/pkgs/build-support/rust/build-rust-crate/configure-crate.nix
index 37fef2abd774..ff04ba6a8173 100644
--- a/pkgs/build-support/rust/build-rust-crate/configure-crate.nix
+++ b/pkgs/build-support/rust/build-rust-crate/configure-crate.nix
@@ -71,6 +71,8 @@ in ''
   export CARGO_PKG_VERSION_MAJOR=${builtins.elemAt version 0}
   export CARGO_PKG_VERSION_MINOR=${builtins.elemAt version 1}
   export CARGO_PKG_VERSION_PATCH=${builtins.elemAt version 2}
+  export NUM_JOBS=1
+  export RUSTC="rustc"
   if [[ -n "${versionPre}" ]]; then
     export CARGO_PKG_VERSION_PRE="${versionPre}"
   fi
diff --git a/pkgs/build-support/rust/build-rust-crate/install-crate.nix b/pkgs/build-support/rust/build-rust-crate/install-crate.nix
index c41df34ca39b..3b0282621ea1 100644
--- a/pkgs/build-support/rust/build-rust-crate/install-crate.nix
+++ b/pkgs/build-support/rust/build-rust-crate/install-crate.nix
@@ -20,9 +20,11 @@ crateName: metadata:
     mkdir -p $out/lib
     cp -r target/build/* $out/lib # */
   fi
-  if [[ "$(ls -A target/bin)" ]]; then
-    mkdir -p $out/bin
-    cp -P target/bin/* $out/bin # */
+  if [[ -d target/bin ]]; then
+    if [[ "$(ls -A target/bin)" ]]; then
+      mkdir -p $out/bin
+      cp -P target/bin/* $out/bin # */
+    fi
   fi
   runHook postInstall
 ''